2019
DOI: 10.7566/jpsj.88.063707
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Field-Reentrant Superconductivity Close to a Metamagnetic Transition in the Heavy-Fermion Superconductor UTe2

Abstract: We present a study of the upper critical field of the newly discovered heavy fermion superconductor UTe 2 by magnetoresistivity measurements in pulsed magnetic fields up to 60 T and static magnetic fields up to 35 T. We show that superconductivity survives up to the metamagnetic transition at H m ≈ 35 T at low temperature. Above H m superconductivity is suppressed. At higher temperature superconductivity is enhanced under magnetic field leading to reentrance of superconductivity or an almost temperature indepe… Show more

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Cited by 169 publications
(200 citation statements)
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“…Uniform magnetic susceptibility, magnetization, NMR Knight shift, and 1/T 1 T support the proximity of metallic ferromagnetic quantum criticality [1,5,6]. An extremely large upper critical field and re-entrant superconductivity have been observed by high-field experiments [1,7,8]. These observations strongly suggest odd-parity superconductivity induced by ferromagnetic fluctuations.…”
mentioning
confidence: 92%
“…Uniform magnetic susceptibility, magnetization, NMR Knight shift, and 1/T 1 T support the proximity of metallic ferromagnetic quantum criticality [1,5,6]. An extremely large upper critical field and re-entrant superconductivity have been observed by high-field experiments [1,7,8]. These observations strongly suggest odd-parity superconductivity induced by ferromagnetic fluctuations.…”
mentioning
confidence: 92%
“…In addition, at least two forms of re-entrant superconductivity have been observed in high magnetic fields, including one that extends the low-field superconducting phase upon precise field alignment along the crystallographic b axis 10 , and an extreme high-field phase that onsets in pulsed magnetic fields above the paramagnetic normal state at angles tilted away from the b axis 11 .…”
Section: Introductionmentioning
confidence: 99%
“…Upon further pressure increase, evidence of suppression of the Kondo energy scale leads to an abrupt disappearance of superconductivity and a transition to a ferromagnetic phase 12 . Together with the ambient pressure magnetic field-induced phenomena 10,11,14,15 , the axes of the magnetic field, temperature, and pressure provide for a very rich and interesting phase space in this system. One of the key questions is in regard to the field-polarized (FP) phase that appears to truncate superconductivity at 34.5 T under proper b-axis field alignment 10,11 , in particular regarding the nature of the coupling of the two phases and whether superconductivity could persist to even higher fields in the absence of the competing FP phase.…”
Section: Introductionmentioning
confidence: 99%
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“…Thus the superconducting state survives under a strong internal field coming through an exchange interaction. The H c2 curve for a field applied parallel to the magnetic hard axis far exceeds the Pauli paramagnetic limitation, and exhibits a re-entrant behavior in URhGe, or an Sshape and L-shape curves in UCoGe and UTe 2 [4] respectively. Those facts clearly point to a triplet pairing rather than a singlet one.…”
Section: Introductionmentioning
confidence: 98%